| Keywords |
Exercise pressor reflex ; Renal vasoconstriction ; Tendon stretch ; Exercise |
| Abstract |
The renal vasoconstriction serves to shunt blood flow from the kidney toward active skeletal muscles during exercise. However, it is not well known that the stimulation of group III muscle afferents reflexly increases sympathoexcitation in the renal arteries. Therefore, we recorded single renal nerve filament response to tendon stretch before and after injection of gadolinium into the popliteal artery in decerebrate cats. In control experiment, the impulse activity of single renal nerve efferent was significantly increased during tendon stretch, while gadolinium significantly reduced the renal sympathetic impulse activity. The blood pressure responses induced by the mechanoreflex activation were significantly increased in both conditions, but the pressor response was substantially attenuated after injection of gadolinium. We conclude that the mechanical component of the exercise pressor reflex may contribute to evoke the renal vasoconstriction during exercise. |